@article{MZM_2021_110_5_a14,
     author = {A. A. Shkalikov},
     title = {Regular {Spectral} {Problems} of {Hyperbolic} {Type} for a {System} of {First-Order} {Ordinary} {Differential} {Equations}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {796--800},
     publisher = {mathdoc},
     volume = {110},
     number = {5},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2021_110_5_a14/}
}